Heinrich Lanz got quite a few tractors into western Canada. I have an ad from 1933 showing a steel-wheeled Lanz being offered in three sizes - 12/20, 15/30, and 22/38.
From testimonials in early 1950s brochures, they take Lanz tractors back to at least 1930 in western Canada. The brochures show box car loads of them coming in to Prairie distribution points.
One 1950s brochure states:
16, 25, 35, 45 hp Ag type with steel or pneumatic tires
16, 20, 25 hp with all purpose, adjustable tread
25,35,45,55 hp road transport/industrial
A company called Western Export Import Co. Ltd. in Saskatoon was a distributor.The card I have is undated but it says Lanz was "proven in Saskatchewan by more than 20 years of operation." 25, 35 and 45 hp tractors were listed.
I have nothing on US sales.